Integration of new UX design on my App

We have created a mobile application called PriceApp the purpose of the App is for end user to shop online, compare prices as we also have a price comparison search engine, which is our value preposition and lastly the end user can have these products delivered to a location of their choice. Now our Apk for both Andriod and IOS have been completed but we would like to integrate a new UX design to make the App look appealing to the end user. We also want the person who will be working this project to be able to integrate a POS system. So the project has two phases to it, we want to integrate our new UX design and we also want to integrate a POS system therefore we are look for a stylish developer who has neat outstanding working work someone who can keep deadlines and is able to communicate. As PriceApp we do not compromise on quality.